
Hiking Imagine that on a cold day you are planning to take a thermos of hot soup with you on a hike. Explain why you might fill the thermos with hot water first before filling it with the hot soup.

Interpretation:
The reason due to which initially water is first added to a thermos before adding hot soup needs to be explained.
Concept introduction:
Molecules of a substances tends to flow hotter regions to cooler regions.
Answer to Problem 106A
As heat is transferred from hot water to thermos. Therefore, hot water is first added then hot soup.
Explanation of Solution
On a cold day, the outer temperature is cold and the soup is hot. As it is already known that molecules tends to flow from hotter area to cooler areas.
As the outside temperature is cold therefore the inside of the thermos will also be cold.
Therefore, hot water is poured in thermos before pouring hot soup as heat from hot water will transferred to the thermos and raising the temperature of the thermos.
Since, the temperature of hot soup and the thermos is almost same resulting in the transferred of very little amount of heat from hot soup to the thermos and the soup stays warmer for a longer period of time.
Heat transfer of substances depends on the temperature of the surroundings.
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Glencoe Chemistry: Matter and Change, Student Edition
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